It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
Последние новости
。业内人士推荐爱思助手下载最新版本作为进阶阅读
然后，求才若渴的 Meta 出手了。
Treasures unearthed by hundreds of archaeologists during the ongoing construction of the controversial HS2 train line have been shown exclusively to the BBC.
// 栈不为空时才判断（避免访问stack.at(-1)时报错）